66156217071 has 12 divisors (see below), whose sum is σ = 102609643032. Its totient is φ = 37803552528.

The previous prime is 66156217063. The next prime is 66156217081. The reversal of 66156217071 is 17071265166.

It is not a de Polignac number, because 66156217071 - 2³ = 66156217063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66156217031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225021000 + ... + 225021293.

It is an arithmetic number, because the mean of its divisors is an integer number (8550803586).

Almost surely, 2^66156217071 is an apocalyptic number.

66156217071 is a deficient number, since it is larger than the sum of its proper divisors (36453425961).

66156217071 is a wasteful number, since it uses less digits than its factorization.

66156217071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450042310 (or 450042303 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 66156217071 in words is "sixty-six billion, one hundred fifty-six million, two hundred seventeen thousand, seventy-one".